You may be able to get drug tested if this is driving you crazy. I've never looked into that before but I think you could probably ask a doctor about it. It might be embarrassing and awkward but also could provide you some peace.

I also agree with kaliope, you went a little too far, that's very understandable, but unfortunately you didn't get away with it unscathed. Best to try to learn from this experience. Anyway, you survived! So that's good.